Have I simply worn out the button or could this be a software issue? I have tried the fn f5 solution, the "end task" solution in task manager with the keypad selected (using the right button on the keypad and or the return button on the keyboard) but nothing seems to work.
This laptop has seen a lot of use in the six years I have had it, so the left button which is used for practically everything could be physically dead. Any attempt at helping me is greatly appreciated!
Clean the keyboard with compressed air (blow compressed air in the gaps between keys). This removes some lint and dust.
Shut down the laptop, removed battery and cable for a moment, press and hold the start button for 58 seconds... and replace the battery.. start the lap top.. if that does not work a technician is a must.